Those are good instructions. You forgot to mention that you will need a Windows 7 CD in the CD tray to run sfc /scannow. Otherwise it will prompt you for it all the time.

If you do not have a Windows 7 Installation DVD however, you can alternatively use a Windows 7 System Recovery Disc. While the above command does fix the MBR, and sometimes that is enough, there still might be an error with.

Learn how to access system recovery options in Windows. such as Startup Repair, that can help you recover Windows from a serious error. Windows 7.